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Look up "Rite in the Rain" notepads. They've got lots of different products. The paper might curl a little bit if they get drenched, but it won't go soft and disintegrate like regular paper. However, keep in mind that just because the paper is waterproof, it doesn't mean your ink is. Grease pencil is probably your best bet, though you should also experiment with whatever ink you normally use, as maybe it's waterproof enough.
